Define an implicit conversion in the scope where client code uses the added methods:
import scala.language.implicitConversions

implicit def stringToDist(s: String): DistFromString =
  new DistFromString(s)
Then, for example,
val support = "Scala".getDom
val p = "Scala".getProb('a')
The Scala compiler can convert the receiver to DistFromString when the requested member is absent from String. The conversion must be imported or otherwise visible, and constructing the finite probability distribution retains the nonempty-string precondition of part (b).
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